Casio #DW6900SN-1 Men's Classic Black Mirror Metallic Chronograph Alarm G Shock Watch Imported Shock Resistant, 200 Meter Water Resistant, EL Backlight with Afterglow Multi-function Alarm, 1/100 Second Stopwatch, Countdown Timer Auto Calendar (pre-programmed until the year 2039), 12/24 Hour Formats Accuracy: +/- 15 seconds per month, Battery: CR2016, Approx. battery life: 2 years Module 1289, Size of case/total weight : 53.2 x 50.0 x 16.3mm / 67g